Method and system of determining a width of a printer ribbon |
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| 申请号 | US15274573 | 申请日 | 2016-09-23 | 公开(公告)号 | US09931867B1 | 公开(公告)日 | 2018-04-03 |
| 申请人 | Datamax-O'Neil Corporation; | 发明人 | Yaw Horng Yap; Teck Siong Soh; Boon Kheng Lim; Aravindkumar Harinarayanan; | ||||
| 摘要 | A printer ribbon supply spindle assembly is provided. The ribbon spindle has multiple segments contiguous to each other. The spindle assembly includes a commutator disposed circumferentially on the first segment of the ribbon spindle and two carbon brushes connected to a voltage source and disposed generally in electrical contact with and on either side of the commutator. The voltage source, the carbon brushes, and the commutator complete an electrical circuit. C-shaped conductive springs are disposed over each of the multiple segments. The c-shaped conductive springs compress when covered by a printer ribbon and become in electrical contact with the commutator and adjacent compressed c-shaped springs, forming additional parallel circuits. An electronic element is disposed at the center of the c-shaped conductive springs. Measuring a change in the circuit due the additional parallel circuits with the electronic element indicates the printer ribbon width. | ||||||
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